<html><head>
<title>Testcase bug - Crash [@ nsHTMLReflowState::GetNearestContainingBlock] with display: -moz-box, generated content, positioning and fieldset</title>
<style>
small::before { content: "m m";}
strike::before { content: "m m";}
</style>
</head>
<body>
<div style="display: -moz-box;">
  <strike style="overflow: -moz-hidden-unscrollable; position: absolute;"></strike>
  <fieldset style="position: relative;">
    <strike style="overflow: -moz-hidden-unscrollable; position: absolute;"><small style="position: relative;">
      <span style="position: absolute;"></span>
    </small>
  </strike>
</fieldset>
</div>
</body>
</html>